Display screen or portion thereof with dual panel graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with dual panel graphical user interface showing our new design; and,

FIG. 2 is a second embodiment thereof.

The broken lines in the drawings illustrate portions of the display screen or portion thereof with dual panel graphical user interface that form no part of the claimed design. 

CLAIM The ornamental designs for a display screen or portion thereof with dual panel graphical user interface, as shown and described. 